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Analytical modeling of fast retransmission and recovery in TCP-RENO

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2 Author(s)
Tsang-Ling Sheu ; Dept. of Electr. Eng., Nat. Sun Yat-Sen Univ., Kaohsiung, Taiwan ; Lien-Wen Wu

This paper presents an analytical model to analyze the characteristics of fast retransmission and recovery when packets are lost in a TCP/IP network. In the model, we consider multiple packets that may be lost in a TCP congestion window, which makes this analysis technically different from the previous models as described in N. Caldwell et al. (2000), J. Padhye et al. (2000), B. Sikdar et al. (2003) and B. Sikdar et al. (2001). One of the significant observation revealed by this paper is that whether or not the lost packets can be fast retransmitted at the (y+1)-th RTT (round-trip time) round simply depends on N,[y], representing the number of packets followed by the first lost packet and were successfully received at receiver at th y-th RTT round. For clarification, the analytical model consists of two cases. The first case assumes that N,[y] is greater than or equal to a threshold k (the number of duplicate acknowledgments), while the second case assumes that N,[y] is less than the threshold k. From the analyses, we have found out that there are certain necessary conditions for the occurrence of fast retransmission, and we have derived an upper bound of the number of lost packets to be successfully recovered using the fast retransmission algorithm.

Published in:

Networks, 2004. (ICON 2004). Proceedings. 12th IEEE International Conference on  (Volume:2 )

Date of Conference:

16-19 Nov. 2004